Arrangement in electric hightension circuit breakers



H. FORWALD May 4, 1954 ARRANGEMENT INELECTRIC HIGH-TENSION CIRCUIT BREAKERS Filed Aug. 15, 1950 M w raw m m QQL /Y 6 Patented May 4, 1 954 UNITED STAT ARRANGEMENT IN ELECTRIC HIGH- TENSION CIRCUIT BREAKERS Haakon Forwald, Valhalla, Ludvika, Sweden, assignor to Allmanna Svenska; Elektriska Aktiebolaget, Vasteras, Sweden, a Swedish corporation Application August 15, 1950, Serial No. 179,505

Claims priority, application Sweden August 18, 1949 2 Claims.

In electric high tension circuit breakers, especially air blast circuit breakers, hitherto generally a plurality of breaking elements have been piled up upon each other to form a column, which column, in its turn, has been arranged on the top of an insulating pillar. At high voltages, this construction has made the circuit breakers so high that, with respect to the stresses caused by the wind power, it has been necessary to divide the breaking elements on two pillars each resting on its own insulating pillar. In spite of this fact, at very high tensions being used nowadays, at this construction the pillars will be too high with respect to the stresses caused by the wind power.

The present invention concerns high tension circuit breakers, and especially an air blast circuit breaker, which without being too high can be designed for the highest voltage that can be used and which further is combined with the advantage that a special carrying insulator is not necessary for the disconnecting switch connected with the circuit speaker.

The invention is chiefly characterized thereby that the'breaking elements of the circuit breaker or piles of such elements are arranged in pairs on the top of one, or if there are more than two pairs of breakin elements or piles thereof, on three or more insulating pillars, and are then suitably arranged in V-forin, and thereby that one of these insulating pillars further carries a gear for a disconnecting switch, the arm of which being swingably pivoted in the housing of said gear. The disconnecting switch is suitably arranged to be operated by an insulator or insulating shaft parallel with said pillar,

It has been previously known at high tension circuit breakers to arrange the breaking points in insulating cylinders arranged in V-form on the top of an insulating pillar. In the known constructions it has, however, been difiicult to arrange in a simple manner a disconnecting switch, so that in such cases the disconnecting switch has been arranged on a separate carrying insulator. It is of course possible to imagine a design of such circuit breakers in which the disconnecting switch is swingably pivoted in a bearing at the outer end of the insulatin cylinders containin the breaking points, but this would give considerable bending stresses on the insulators carrying the breaking elements. The arrangement of the disconnecting switch upon the insulatin cylinder rather than upon a separate insulator saves cost in construction and also has the advantage that the operating mechanism for the switch is placed in close proximity to the operating mechanism for the breaking elements.

By the fact that, according to th invention, the disconnecting switch is pivoted in a gear housing on the top of the carrying insulator carrying a part of the breaking elements, the gain is attained that, besides the saving of costs for a separate carrying insulator for the disconnecting switch, the mechanism of the disconnecting switch and thus its arm by an external connection can be connected to the free end of any of the breaking elements arranged in V-form or piles of such elements, and further the gain is attained that these elements or piles thereof independently of each other and of the disconnecting switch can be removed and replaced by spare elements.

On the accompanying drawin Fig. 1 is a perspective view showing a, circuit breaker according to the invention and Fig. 2 is a detail view shown partly in section. On the drawing, l designates the base frame of the circuit breaker, on which two insulating pillars 2 and 3 are mounted. On the top of the insulator 2, a metal pipe 5 is attached which carries a joining piece I which, in its turn, carries the two breaking elements 9 and it. On the top of the insulator 3, a gear housing 6 is attached, on which on one hand an insulating cyiinder i is attached which carries a joining piece 3 carrying the breaking elements I I and I2. The disconnecting switch arm I4 is pivoted at 20 in the gear housing 6 and is operated by an insulating operating shaft I3 through the medium of the bevel gears I9. The stationary contact iii of the disconnecting switch is attached on the top of the free insulator l5. IT is a connection from the disconnecting switch arm to the breaking element l2, and the breaking element H is by the connection l8 connected with the breaking element ill. The connection of the circuit breaker to the network takes place on one hand at the free end of the breaking element 9- and on the other hand at the stationary disconnecting switch contact I6.

I claim as my invention:

1. A high tension circuit breaker with a plurality of series connected air blast breaking elements, comprising at least one insulating pillar, breaking units arranged in pairs upon the top of said pillar, a pivoted disconnecting switch arm, gear means for the actuation of said arm, a gear casing carried by said pillar and enclosing said gear means, insulating means between said pair of breaking units, an electrical connection between said casing and one or the extremities of lated from said casing by said extension, means electrically connecting said pairs in series, and means electrically connecting said switch arm With one extremity of said series-connected pairs.

References Cited in the file of this patent UNITED STATES PATENTS Name Date Barcus et a1 Apr. 22, 1947 Amer Nov. 23, 1948 Number 

